Documentation

Support

Vivox Core SDK

Vivox Core SDK

Read and alter audio data for each participant

Managing individual participant audio data.
Read time 1 minuteLast updated 20 hours ago
The 
pf_on_audio_unit_before_recv_audio_mixed
callback provides a parameter with type 
vx_before_recv_audio_mixed_participant_data_t *
called 
participants_data
. An example of how to use this pointer to access an array of separate participants’ audio data is shown in the code sample below. 
void SDKSampleApp::OnBeforeReceivedAudioMixed(const char *session_group_handle, const char *initial_target_uri, vx_before_recv_audio_mixed_participant_data_t *participants_data, size_t num_participants){    std::string example_uri = “example_uri”;    // Iterate over the multiple audio streams    for (unsigned int i = 0; i < num_participants; i++) {        auto &data = participants_data[i];         int channels_per_frame = data.channels_per_frame;        std::string participant_uri = data.participant_uri;         if (participant_uri == example_uri) {            for (unsigned int f = 0; f < data.pcm_frame_count; f++) {                for (unsigned int c = 0; c < channels_per_frame; c++) {                    // Use / modify the audio data. Here we're simply dividing the samples by 2.                    data.pcm_frames[(f * channels_per_frame) + c] /= 2;                }            }        }    }}